Comparison of five strains of a parthenogenetic species, Macrotrachela quadricornifera (Rotifera, Bdelloidea)

Hydrobiologia ◽  
1991 ◽  
Vol 211 (2) ◽  
pp. 157-163 ◽  
Author(s):  
Manuela Pagani ◽  
Claudia Ricci ◽  
Anna Maria Bolzem
Keyword(s):  
Parthenogenetic Species ◽  
Macrotrachela Quadricornifera ◽  
Rotifera Bdelloidea

Oogenesis in Macrotrachela quadricornifera (Rotifera, Bdelloidea)

Hydrobiologia ◽  
1993 ◽  
Vol 255-256 (1) ◽  
pp. 225-230 ◽  
Author(s):  
Manuela Pagani ◽  
Claudia Ricci ◽  
Carlo Alberto Redi
Keyword(s):  
Macrotrachela Quadricornifera ◽  
Rotifera Bdelloidea

Oogenesis in Macrotrachela quadricornifera (Rotifera, Bdelloidea)

1993 ◽  
pp. 225-230
Author(s):  
Manuela Pagani ◽  
Claudia Ricci ◽  
Carlo Alberto Redi
Keyword(s):  
Macrotrachela Quadricornifera ◽  
Rotifera Bdelloidea

The scale insect Coccus pseudomagnoliarum (Kuwana) (Hemiptera: Coccomorpha: Coccidae) on citrus in Greece

2020 ◽  
Vol 13 (2) ◽  
pp. 93-97
Author(s):  
G.J. Stathas ◽  
Ch.F. Karipidis
Keyword(s):  
Citrus Sinensis ◽  
Maximum Rate ◽  
Scale Insect ◽  
Instar Nymph ◽  
Summer Period ◽  
Parasitoid Species ◽  
Parthenogenetic Species

SummaryPhenology and parasitism of the scale insect, Coccus pseudomagnoliarum (Kuwana) (Hemiptera: Coccomorpha: Coccidae), infesting Citrus sinensis (Rutaceae), were studied in Papagou area, in northeastern Athens, from June 2015 to June 2017. Coccus pseudomagnoliarum is a univoltine, viviparous, parthenogenetic species. It overwintered as settled 1st instar nymph on the shoots of the trees. The 2nd instar nymphs appeared between the beginning of April and the end of May, and the mature females were recorded from the beginning of May until the middle of June. The crawlers appeared between the middle of May and the middle of June and the 1st instar nymphs settled on the shoots at the end of May, where they remained during the whole summer period, winter, until the beginning of April next year. Parasitism of the scale was recorded between the beginning of May and the middle of May and reached a maximum rate of 35%. The recorded parasitoid species were Coccophagus shillongensis Hayat and Singh (Hymenoptera: Aphelinidae), Coccophagus spp. and Metaphycus dispar (Mercet) (Hymenoptera: Encyrtidae).

Developmental deformities in the parthenogenetic lizard Cnemidophorus uniparens (Teiidae) and the "anomalous male" phenomenon

1986 ◽  
Vol 64 (11) ◽  
pp. 2418-2424 ◽  
Author(s):  
Allen J. Billy
Keyword(s):  
Sexual Differentiation ◽  
Vertebral Column ◽  
Female Offspring ◽  
Bisexual Species ◽  
Developmental Defects ◽  
Unresolved Problem ◽  
Parthenogenetic Species ◽  
Parthenogenetic Female ◽  
Lower Jaw ◽  
Cnemidophorus Uniparens

Parthenogenetic species of lizard occasionally produce male progeny characterized by developmental defects and low viability. Production of anomalous males is an unresolved problem in sexual differentiation as parthenogenetic female lizards are expected to produce female offspring. The "anomalous male" phenomenon was examined by sexing nonviable embryos produced by the parthenogenetic whiptail lizard Cnemidophorus uniparens. Twenty-six deformed embryos were obtained; all were female except for three which did not possess gonads. Male embryos were not detected. Developmental deformities found in Cnemidophorus embryos included anophthalmia, micropthalmia, encephalocoele, hypoplasia of the lower jaw, head foreshortening, gastroschisis, and malformations of the vertebral column. Several embryos possessed a combination of defects. Four hypotheses are presented to account for production of anomalous males by reptilian parthenoforms. Three hypotheses involve production of sex-reversed males (genetic females). A fourth hypothesis asserts that anomalous males are derived from hybridization events between a female from a unisexual species and a male from a bisexual species. Of the four hypotheses, the hybridization hypothesis has the greatest utility in explaining production of anomalous males by parthenogenetic lizards.

Oogenesis (Prophase 1 of Meiosis) and Mitotic Chromosomes of Parthenogenetic Species Darevskia armeniaca (Family Lacertidae)

2021 ◽  
Vol 48 (3) ◽  
pp. 274-280
Author(s):  
L. A. Kupriyanova ◽  
L. D. Safronova ◽  
V. B. Sycheva ◽  
F. D. Danielyan ◽  
V. G. Petrosyan
Keyword(s):  
Mitotic Chromosomes ◽  
Parthenogenetic Species

Descriptions of two new species of Philodina (Rotifera, Bdelloidea), with notes on seven rare bdelloids from Korea

Zootaxa ◽  
2020 ◽  
Vol 4772 (2) ◽  
pp. 253-276
Author(s):  
MIN OK SONG ◽  
CHANG-HO LEE
Keyword(s):  
New Species ◽  
Species Level ◽  
Taxonomic Study ◽  
Mitochondrial Cytochrome ◽  
Bdelloid Rotifers ◽  
Subspecies Level ◽  
Two New Species ◽  
Terrestrial Habitats ◽  
I Gene ◽  
Rotifera Bdelloidea

A taxonomic study on bdelloid rotifers collected from various terrestrial habitats at five different locations in Korea resulted in eight new Korean records and two new species-level taxa, Philodina clypeata  n. sp. and P. verrucosa  n. sp. Among the eight new Korean records, two species- and three subspecies-level taxa are new to Asia as well. These new Korean records also include seven rare species/subspecies-level taxa with poorly known distributions. Habrotrocha gracilis quadridens Schulte and Macrotrachela zickendrahti seda Donner were rediscovered in Korea 64 and 53 years, respectively, after the original descriptions. Habrotrocha ligula aligula Burger, Macrotrachela insulana Donner, M. petulans Milne, M. pinnigera (Murray), and Philodina parvicalcar De Koning have been reported from two to three countries only including their type localities before the present study. In addition, a partial sequence of mitochondrial cytochrome c oxidase subunit I gene (mtCOX1) for P. verrucosa  n. sp. as well as a taxonomic key for the Philodina species recorded from Korea to date are also provided here. 

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